Somayeh Mohammady - Academia.edu (original) (raw)

Papers by Somayeh Mohammady

Journal of Electrical Engineering, 2009

The application of digital predistortion in base band signal is an extended method of amplifier l... more The application of digital predistortion in base band signal is an extended method of amplifier linearization to reduce the Adjacent Channel Interference (ACI) in those systems in which a varying envelope modulation scheme like OFDM and MQAM is used. Digital baseband predistortion is a highly cost-effective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA

The 17th Asia Pacific Conference on Communications, 2011

High peak to average power ratio (PAPR) is the main drawback of orthogonal frequency division mul... more High peak to average power ratio (PAPR) is the main drawback of orthogonal frequency division multiplexing (OFDM) systems. Some of the proposed PAPR reduction solutions are dummy insertion (DSI), selected mapping (SLM) and combined DSI-SLM scheme. This paper presents FPGA implementation of DSI-SLM scheme for OFDM signals. The results of the implementation and simulation are compared which show that the

Books by Somayeh Mohammady

IntechOpen, 2019

It is fascinating to know that the multiplexing can be employed and defined from different points... more It is fascinating to know that the multiplexing can be employed and defined
from different points of views and different disciplines. For example, Dr. E. Julius
Dasch, former manager of the NASA National Space Grant Program, defines multiplexing on his dictionary book [1] as:
…the simultaneous transmission of different data from a spacecraft using a single
channel. The data stream is separated into frames that carry codes for different
information, such as temperatures, pressures, and the state of on-board computers.
In a media and communication dictionary book [2], multiplexing is mentioned as:
Digital television transmission allows for multiplexing, whereby multiple channels
are bundled together and sent simultaneously in a single stream of data.
In a computer science dictionary book [3], multiplexing is described as:
…the process of combining multiple messages simultaneously on the same physical or
logical transmission medium. There are two main types: time division multiplexing
(TDM) and frequency division multiplexing (FDM).
The list continues for the Internet, optic engineering, graphics, phytography,
laser and photonics geology, earth sciences, and many more.

Journal of Electrical Engineering, 2009

The application of digital predistortion in base band signal is an extended method of amplifier l... more The application of digital predistortion in base band signal is an extended method of amplifier linearization to reduce the Adjacent Channel Interference (ACI) in those systems in which a varying envelope modulation scheme like OFDM and MQAM is used. Digital baseband predistortion is a highly cost-effective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA

The 17th Asia Pacific Conference on Communications, 2011

High peak to average power ratio (PAPR) is the main drawback of orthogonal frequency division mul... more High peak to average power ratio (PAPR) is the main drawback of orthogonal frequency division multiplexing (OFDM) systems. Some of the proposed PAPR reduction solutions are dummy insertion (DSI), selected mapping (SLM) and combined DSI-SLM scheme. This paper presents FPGA implementation of DSI-SLM scheme for OFDM signals. The results of the implementation and simulation are compared which show that the

IntechOpen, 2019

It is fascinating to know that the multiplexing can be employed and defined from different points... more It is fascinating to know that the multiplexing can be employed and defined
from different points of views and different disciplines. For example, Dr. E. Julius
Dasch, former manager of the NASA National Space Grant Program, defines multiplexing on his dictionary book [1] as:
…the simultaneous transmission of different data from a spacecraft using a single
channel. The data stream is separated into frames that carry codes for different
information, such as temperatures, pressures, and the state of on-board computers.
In a media and communication dictionary book [2], multiplexing is mentioned as:
Digital television transmission allows for multiplexing, whereby multiple channels
are bundled together and sent simultaneously in a single stream of data.
In a computer science dictionary book [3], multiplexing is described as:
…the process of combining multiple messages simultaneously on the same physical or
logical transmission medium. There are two main types: time division multiplexing
(TDM) and frequency division multiplexing (FDM).
The list continues for the Internet, optic engineering, graphics, phytography,
laser and photonics geology, earth sciences, and many more.